Two layerlike supramolecular assemblies based on B-Anderson-type polyanionic clusters and their adsorption property

Abstract

Two layerlike supramolecular assemblies that consist of Ag-supported B-Anderson-type clusters (H2bpp)[Ag{AlMo6(OH)6O18}]·2.5H2O (1) and (H2bpe)[Ag(OH2){AlMo6(OH)6O18}] (2) [bpp = 1,3-di(4-pyridyl)propane; bpe = 1,2-di(4-pyridyl)ethylene] have been synthesized and characterized. X-ray diffraction analysis reveals that the supramolecular structures of two compounds are built upon alternative arrangements of inorganic anionic and organic cationic layers. In 1 and 2 the oxophile silver centers have different coordination modes to bridge Anderson-type clusters into 2D inorganic anionic layers. There are extensive noncovalent forces among inorganic anions and organic cations to construct 3D supramolecular frameworks of compounds 1-2. The preliminary experiments show that the two crystals possess an adsorption-desorption property for methylene blue (MB). Crystal 2 shows a very fast adsorption rate towards MB, and a relatively high value (ca. 90%) can be reached within 15 min.